Description:

Diffutils includes four utilities: diff, cmp, diff3 and sdiff. Diff
compares two files and shows the differences, line by line. The cmp
command shows the offset and line numbers where two files differ, or cmp
can show the characters that differ between the two files. The diff3
command shows the differences between three files. Diff3 can be used when
two people have made independent changes to a common original; diff3 can
produce a merged file that contains both persons' changes and warnings
about conflicts. The sdiff command can be used to merge two files
interactively.

Install diffutils if you need to compare text files.